[PATCH 3/3] linux/bitmap: Replace find_fisrt_{zero_}bit with the new lightweight api

Jia He
2015-11-19T02:32:27Z

This is to replace find_fisrt_{zero_}bit with the new lightweight api
all_bit_is_{one,zero} in bitmap_{full,empty}

Signed-off-by: Jia He <hejianet@gmail.com>
---
include/asm-generic/bitops/find.h | 3 +++
include/linux/bitmap.h | 4 ++--
2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/bitops/find.h b/include/asm-generic/bitops/find.h
index 998d4d5..1ec1d45 100644
--- a/include/asm-generic/bitops/find.h
+++ b/include/asm-generic/bitops/find.h
@@ -59,4 +59,7 @@ extern unsigned long find_first_zero_bit(const unsigned long *addr,

#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */

+extern unsigned int all_bit_is_one(const unsigned long *addr, unsigned size);
+extern unsigned int all_bit_is_zero(const unsigned long *addr, unsigned size);
+
#endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 15524f6..8877a68 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -281,7 +281,7 @@ static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
if (small_const_nbits(nbits))
return ! (*src & BITMAP_LAST_WORD_MASK(nbits));

- return find_first_bit(src, nbits) == nbits;
+ return all_bit_is_zero(src, nbits);
}

static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
@@ -289,7 +289,7 @@ static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
if (small_const_nbits(nbits))
return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));

- return find_first_zero_bit(src, nbits) == nbits;
+ return all_bit_is_one(src, nbits);
}

static __always_inline int bitmap_weight(const unsigned long *src, unsigned int nbits)
--
2.5.0